I have often said that the best "Tridentine" solution would be to coordinate the calendars of the older and the newer Missal in some way and allow the use of the new prefaces in the older rite. In this way, the older form of Mass could make a greater impact and accelerate a new organic liturgical development.
Some who sport news about the forthcoming Motu Proprio say no coordination will take place. Wishful thinking? It strikes me that coordinating the calendars, even issuing a new form of "Tridentine" Missal with the changes in place and, for example, newer prefaces in an appendix, is exactly the sort of thing that Pope Benedict would want. I could be wrong, of course.
Now I read this story from Quotidiano.net (my translation and emphases)
Vaticano, 9 marzo 2007 – An acceleration for the Mass in Latin.
According to authoritative Vatican sources, the proofs of the Missal according to the rite of St. Pius V are already ready. Catholic publishers are thus setting final copy of the Missal in Latin which will consist of both the specific edition for the altar as well as the one intended for the faithful.
The work will be subject to the approval of the Papal Commission [sic] Ecclesia Dei presided over by Cardinal Dario Castrillon Hoyos, lately the Prefect of the Pontifical Council [sic] for the Clergy. This is a signal indicating how the Pope, with great deliberation, is preparing the ‘Motu proprio’ with which use of the pre-conciliar Missal will be derestricted. The way could be opened up before Easter and, in addition, Cardinal Estevez Medina [sic] took the opportunity to announce that the ‘Motu proprio’ is "imminent".
Compromising this report are, of course, the little errors I indicate. However, what is related here is not out of keeping with other things I have heard.
We shall see soon enough. Frankly, I hope that what is related above is true.
In the meantime, there ought to be some coordination of the calendars one way or another. This would be really tricky, and I am not sure how this would work in light of pre-Lenten Sundays. It could be that a partial coordination of the calendars for the celebrations of the feasts of saints would be all that is necessary.
I frankly don’t care if the new calendar is abandoned in favor of the older (which ain’t gonna happen) or the newer calendar is used to coordinated celebrations of the so-called "Tridentine" Mass with the rest of the Church each day. The new saints and some new propers could enrich the older Rite, as could an option to use newer prefaces. In no way would I condone, however, the expunging of the pre-Lenten Sundays.
This is all speculation of course. And I am sure that the truly "fly-in-amber" Traditionalists will completely freak out at the suggestion that the newer Rite has anything useful for the older Rite. But… happily… they don’t make these decisions.